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173 results for “Synalpheus”
Fig. 2 in The soft-coral associated pistol shrimp Synalpheus neomeris (De Man) (Decapoda: Alpheidae) defends its host against nudibranchs in Okinawa, Japan
Fig. 2. Feeding behaviour of Tritonia sp. on polyps of the soft coral Dendronephthya hyalina, in the aquarium. A, Tritonia sp. continued feeding on polyps of D. hyalina in the absence of Synalpheus neomeris; B, Tritonia sp. is being attacked by S. neomeris (1) and leaves the D. hyalina colony soon after (2–4). Scale bar = 10 mm
Fig. 3 in The soft-coral associated pistol shrimp Synalpheus neomeris (De Man) (Decapoda: Alpheidae) defends its host against nudibranchs in Okinawa, Japan
Fig. 3. Behaviour of Dermatobranchus caeruleomaculatus observed in the field. A, On 16 November 2011, D. caeruleomaculatus continued feeding on the polyps of D. hyalina in the absence of pistol shrimps; B, On 7 April 2012, Synalpheus neomeris (encircled) attacked D. caeruleomaculatus, which immediately stopped feeding on D. hyalina polyps; C, Six colonies of Dendronephthya hyalina collected on 7 April 2012; arrow pointing to observed colony. Scale bar = 10 mm.
Fig. 1 in The soft-coral associated pistol shrimp Synalpheus neomeris (De Man) (Decapoda: Alpheidae) defends its host against nudibranchs in Okinawa, Japan
Fig. 1. Collection sites of soft coral, pistol shrimps and nudibranchs: Oura Bay, Okinawa Island, Japan (26°32ʹN, 128°03ʹE). The octocoral Dendronephthya hyalina, the pistol shrimp Synalpheus neomeris, and the nudibranchs, Tritonia sp. and Dermatobranchus caeruleomaculatus, were collected in the inner part of the bay at a depth range of 15 to 30 m.
FIGURE 1 in Description of the first zoeal stage of Synalpheus apioceros Coutière, 1909 (Caridea Alpheidae), including a comparative analysis with larval morphology from the genus Synalpheus Spence Bate, 1888
FIGURE 1. Synalpheus apioceros Coutière, 1909, Zoea I. a. Dorsal view; b. Lateral view; c. Antennule; d. Antenna; e. Maxillule; f. Maxilla; g–i. First–third maxillipeds; j–n. Pereiopods I–V; o. Telson. (Scale bars: a, b = 0.2 mm; c, h, j, k, l, m, n, o = 0.1 mm; d, g, i = 0.05 mm; e, f = 0.02mm).
FIGURE 5. Synalpheus quinquedens Tattersall, 1921 in A new sponge-dwelling species of Synalpheus Spence Bate, 1888 (Decapoda Caridea: Alpheidae) from the Persian Gulf
FIGURE 5. Synalpheus quinquedens Tattersall, 1921, (A) male (CL 7.38 mm) from Farur Island, Iran (MNHN-IU-2014-1225); (B) female (CL 8.08 mm) from Farur Island, Iran (MNHN-IU-2014-1225). Photographs by Rashed Abdollahi.
FIGURE 6. Synalpheus quinquedens Tattersall, 1921 in A new sponge-dwelling species of Synalpheus Spence Bate, 1888 (Decapoda Caridea: Alpheidae) from the Persian Gulf
FIGURE 6. Synalpheus quinquedens Tattersall, 1921, female from Farur Island, Iran (CL 12.3 mm) (MNHN-IU-2014-1225), (A) anterior region, dorsal view; (B) third maxilliped, ventrolateral view; (C) minor cheliped, mesial view; (D) same, palm and fingers, dorsomesial view.
FIGURE 4. Synalpheus pentaspinosus n in A new sponge-dwelling species of Synalpheus Spence Bate, 1888 (Decapoda Caridea: Alpheidae) from the Persian Gulf
FIGURE 4. Synalpheus pentaspinosus n. sp., (A) paratype, male (CL 6.7 mm) from Larak Island, Iran (MNHN-IU-2014- 1223); (B) paratype, female (CL 8.4 mm) from the same locality (MNHN-IU-2014-1223); (C) allotype, female (CL 7.9 mm) from the same locality (MNHN-IU-2014-1222). Photographs by Rashed Abdollahi.
FIGURE 3. Synalpheus pentaspinosus n in A new sponge-dwelling species of Synalpheus Spence Bate, 1888 (Decapoda Caridea: Alpheidae) from the Persian Gulf
FIGURE 3. Synalpheus pentaspinosus n. sp., holotype, male from Larak Island, Iran (MNHN-IU-2014-1221), (A) second pereiopod; (B) third pereiopod; (C) fourth pereiopod; (D) fifth pereiopod; (E) same, propodus and dactylus, mesial view.
FIGURE 2. Synalpheus pentaspinosus n in A new sponge-dwelling species of Synalpheus Spence Bate, 1888 (Decapoda Caridea: Alpheidae) from the Persian Gulf
FIGURE 2. Synalpheus pentaspinosus n. sp., holotype, male from Larak Island, Iran (MNHN-IU-2014-1221), (A) major cheliped, dorso-lateral view; (B) same, palm and fingers, mesial view; (C) same, lateral view; (D) minor cheliped, mesial view; (E) same, lateral view; (F) same, palm and fingers, mesial view.
FIGURE 1. Synalpheus pentaspinosus n in A new sponge-dwelling species of Synalpheus Spence Bate, 1888 (Decapoda Caridea: Alpheidae) from the Persian Gulf
FIGURE 1. Synalpheus pentaspinosus n. sp., holotype, male from Larak Island, Iran (MNHN-IU-2014-1221), (A) anterior region, dorsal view; (B) anterior region, lateral view; (C) pleon, lateral view; (D) telson and uropods; (E) third maxilliped, ventro-lateral view.
Data from: Social control of reproduction and breeding monopolization in the eusocial snapping shrimp Synalpheus elizabethae
Understanding why individuals within altruistic societies forego reproduction to raise others' offspring has fascinated scientists since Darwin. Although worker polymorphism is thought to have evolved only in sterile workers, worker subcastes appear to be common among social invertebrates and vertebrates. We asked whether sterility accompanies eusociality and morphological differentiation in snapping shrimps (Synalpheus) - the only known marine eusocial group. We show that workers in S. elizabethae are reproductively totipotent, and that female — but not male — gonadal development and mating are mediated by the presence of a queen, apparently without physical aggression. In queenless experimental colonies, a single immature female worker typically became ovigerous, and no female workers matured in colonies with a resident queen. Thus, eusocial shrimp workers retain reproductive totipotency despite signs of morphological specialization. The failure of most female workers to mature is instead facultative and mediated by the presence of the queen, ensuring her reproductive monopoly.
FIGURE 15 in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 15. Sponge hosts of some species from the Synalpheus paraneptunus Coutière, 1909 species complex: A, several members of a colony of Synalpheus duffyi n. sp. in their host sponge, possibly Neopetrosia subtriangularis, Isla Grande, Panama; B, same, close-up of a non-breeding colony member; C, Xestospongia rosariensis, main host of Synalpheus bocas n. sp., Bocas del Toro, Panama; D, same, longitudinal section showing details of canals; E, Xestospongia sp., occasional host of S. bocas n. sp., Bocas del Toro, Panama. Scale bars: ~3 mm (A, B), ~5 cm (C–E).
FIGURE 5. Synalpheus duffyi n in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 5. Synalpheus duffyi n. sp., paratype, non-breeding specimen (colony member) from Isla Grande, Panama (USNM 1116682) [A–F]; paratype, breeding female (queen) (USNM 1116682) [G]: A, major cheliped of non-breeding specimen, lateral view; B, same, mesial view; C, major chela, distal portion with opened fingers, lateral view; D, minor cheliped, mesial view; E, minor chela with opened fingers, lateral view, F, same, dorsolateral aspect; G, major cheliped of breeding female (queen), lateral view. Scale bar: 0.5 mm (C–F), 1 mm (A, B, G).
FIGURE 12. Synalpheus belizensis n in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 12. Synalpheus belizensis n. sp., holotype, breeding female from Carrie Bow Cay, Belize (USNM 1116695) [A–G]; paratype, male (USNM 1116696) [H, I]: A, frontal region, dorsal view; B, same, lateral view; C, third maxilliped, lateral view; D, second pereiopod, lateral view; E, third pereiopod, lateral view; F, abdomen, lateral view; G, telson and uropods, dorsal view; H, aberrant frontal region, dorsal view; I, abdomen, lateral view. Scale bar: 0.5 mm (A–E, G, H), 1 mm (I), 2 mm (F).
FIGURE 7. Synalpheus riosi n in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 7. Synalpheus riosi n. sp., holotype, breeding female from Prince Rupert Bay, Dominica (USNM 136272) [A– D]; paratype, non-breeding specimen (colony member) (USNM 1116697) [E–H]: A, major cheliped of queen, lateral view; B, same, mesial view; C, minor cheliped of queen, lateral view; D, same, chela and carpus, mesial view; E, major chela of paratype with opened fingers, lateral view; F, same, distodorsal tooth of palm, lateral view; G, minor chela of paratype with slightly opened fingers, mesial view; H, same, dorsomesial aspect. Scale bar: 0.5 mm (C–H), 1 mm (A, B).
FIGURE 4. Synalpheus duffyi n in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 4. Synalpheus duffyi n. sp., paratype, non-breeding specimen (colony member) from Isla Grande, Panama (USNM 1116682) [A–G]; paratype, breeding female (queen) (USNM 1116682) [H, I]; three other paratypes, all nonbreeding specimens (USNM 1116682) [J–L]: A, frontal region, dorsal view; B, same, lateral view; C, third maxilliped, lateral view; D, second pereiopod, lateral view; E, third pereiopod, lateral view; F, abdomen of non-breeding specimen, lateral view; G, telson and uropods, dorsal view; H, aberrant frontal region, dorsal view; I, abdomen of breeding female (queen), lateral view; J, K, L, frontal margin of carapace (with basal antennular segments in J and K), dorsal view. Scale bar: 0.5 mm (A–E, G, H, J–L), 1 mm (F, I).
FIGURE 9. Synalpheus brevidactylus n in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 9. Synalpheus brevidactylus n. sp., breeding female from Boca del Drago, Bocas del Toro, Panama (USNM 1116686): A, frontal region, dorsal view; B, second pereiopod, lateral view; C, third pereiopod, lateral view; D, right uropod, distolateral fixed teeth and spine-like seta, dorsal view. Scale bar: 0.5 mm (A–D).
FIGURE 2 in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 2. Synalpheus cf. paraneptunus Coutière, 1909, original paratype, non-breeding specimen from Jamaica (USNM 41722): A, frontal region, dorsal view; B, third maxilliped, lateral view; C, major cheliped, mesial view; D, minor cheliped, lateral view; E, same, chela, mesial view; F, second pereiopod, lateral view; G, third pereiopod, lateral view; H, abdomen, lateral view; I, telson and uropods, dorsal view. Scale bar: 0.5 mm (A, B, D–G, I), 1 mm (C, H).
FIGURE 1 in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 1. Synalpheus paraneptunus Coutière, 1909, holotype, non-breeding specimen from Morrosquillo, Colombia (USNM 7770): A, frontal region, dorsal view; B, third maxilliped, lateral view (missing spine-like setae indicated, number unknown); C, major cheliped, lateral view; D, minor cheliped, mesial view; E, same, chela, lateral view; F, third pereiopod, lateral view; G, abdomen, lateral view; H, telson and right uropod, dorsal view (missing spine-like setae indicated); I, left uropod, detail of distolateral teeth (missing spine-like setae indicated). Scale bar: 0.5 mm (A, B, E, F, H, I), 1 mm (C, D, G).
FIGURE 11. Synalpheus bocas n in A preliminary revision of the Synalpheus paraneptunus Coutière, 1909 species complex (Crustacea: Decapoda: Alpheidae)
FIGURE 11. Synalpheus bocas n. sp., paratype, male from Bocas del Toro, Panama (USNM 1116692) [A–E]; paratype, male (USNM 1116690) [F]: A, major cheliped, lateral view; B, same, chela, mesial view; C, same, distal portion with opened fingers, lateral view; D, minor cheliped, lateral view; E, same, chela with opened fingers, mesial view, F, minor chela of young male with opened fingers, dorsolateral aspect. Scale bar: 0.5 mm (C–F), 1 mm (A, B).
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