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63 results for “Desmosomatidae”
Evolution and phylogeny of the deep-sea isopod families Desmosomatidae Sars, 1897 and Nannoniscidae Hansen, 1916 (Isopoda: Asellota)
<p>In the deep sea, the phylogeny and biogeography of only a few taxa have been well studied. Although more than 200 species in 32 genera have been described for the asellote isopod families Desmosomatidae Sars, 1897 and Nannoniscidae Hansen, 1916 from all ocean basins, their phylogenetic relationships are not completely understood. There is little doubt about the close relationship of these families, but the taxonomic position of a number of genera is so far unknown. Based on a combined morphological phylogeny using the Hennigian method with a dataset of 107 described species and a molecular phylogeny based on three markers (COI, 16S, and 18S) with 75 species (most new to science), we could separate Desmosomatidae and Nannoniscidae as separate families. However, we could not support the concept of the subfamilies Eugerdellatinae Hessler, 1970 and Desmosomatinae Hessler, 1970. Most genera of both families were well supported, but several genera appear as para- or even polyphyletic. Within both families, convergent evolution and analogies caused difficulty in defining apomorphies for phylogenetic reconstructions and this is reflected in the results of the concatenated molecular tree. There is no biogeographic pattern in the distribution as the genera occur over the entire Atlantic and Pacific Ocean, showing no specific phylogeographical pattern. Poor resolution at deep desmosomatid nodes may reflect the long evolutionary history of the family and rapid evolutionary radiations.</p>
FIG. 12 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 12. (A±F) Antennula of species of diOEerent genera of the subfamily Leutzinae. (A) Panetela wol. (B) Exiliniscus acuteatus. (C) Thaumastosoma platycarpus. (D) Austroniscus norbi. (E) Nannoniscella biscutatus. (F) Leutziniscus jebamoni. (G) Antennula of the subfamily ConusinaeÐNannonisconus latipleonus. (Sources various.)
FIG. 10. Exiliniscus chandravoli n in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 10. Exiliniscus chandravoli n. sp., holotype female, length 2.9 mm. (A) Dorsal view. (B) Antennula. (C) Antenna. (D, E) Second pereopod. (F) Sixth pereopod. (G) Seventh pereopod. (H, I) Lateral view of the pleon showing the operculum. (J) Uropod.
FIG. 11 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 11. (A) Female Nannoniscella biscutatus (Siebenallerand Hessler, 1977) and (B) female Nannoniscoide s latediOEusus Siebenaller and Hessler, 1977.
FIG. 16. First pereopod with large carpus with immovable and elongated claw forming a in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 16. First pereopod with large carpus with immovable and elongated claw forming a hand and the movable propodus with ventral fringe and terminal claw, in three species of the genus Prochelator. (A) P. lateralis, (B) P. sarsi and (C) P. abyssalis.
FIG. 7 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 7. Five genera of the subfamily Leutzinae. (A) Leutziniscus e.g. L. jebamoni. (B) Thaumastosoma e.g. T. platycarpus Hessler, 1970. (C) Panetela e.g. P. wol Siebenaller and Hessler, 1981. (D) Exiliniscus e.g. E. clipeatus Siebenaller and Hessler, 1981. (E) Austroniscus e.g. A. norbi Svavarsson, 1982.
FIG. 14 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 14. Mirabilicoxa gracilipes (Hansen, 1916)Ðtype species. (A) Female. (B) Male. (C) Female operculum. (D) Male second pleopod with stylet. (E) Male ®rst pleopod.
FIG. 5. Prochelator sarsi n in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 5. Prochelator sarsi n. sp., Holotype female, length 2.6 mm. (A) Dorsal view. (B) Antennula. (C, D) First pereopod. (E, F) Second pereopod. (G) Third pereopod. (H, I) Fourth pereopod. (J) Seventh pereopod. (K) Uropod.
FIG. 2. Mirabilicoxa hessleri n in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 2. Mirabilicoxa hessleri n. sp., Holotype male, length 2.8 mm. (A) Dorsal view. (B, C) First pereopod. (D) Second pereopod. (E) Fourth pereopod. (F) Uropod. (G) Antenna. (H) Antennula.
FIG. 1 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 1. Beaufort±Bermuda transect in the northwestern Atlantic Ocean showing the four study-sites oOE North Carolina coast. (I) Site Alpha (square) on the upper Carolina slope. (II) Site Beta (rectangle) on the lower Carolina slope. (III) Site Sigma (round) on the continental rise and (IV) Site Omega (triangle) on the Hatteras abyssal plain.
FIG. 6 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 6. Five genera of the subfamily Nannoniscidae. (A) Nannoniscus e.g. N. muscarius (Menzies and George, 1972). (B) Regabellator e.g. R. profugus Siebenaller and Hessler, 1881. (C) Raponiscus e.g. R. crasipes (Hansen, 1916). (D) Hebefustis e.g. H. vafer Siebenaller and Hessler, 1977. (E) Nannoniscoides e.g. N. latediOEusus Siebenaller and Hessler, 1977.
FIG. 3. Mirabilicoxa alberti n in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 3. Mirabilicoxa alberti n. sp. Holotype female, length 2.8 mm. (A) Dorsal view. (B) Antennula and basal articles of antenna. (C) First pereopod. (D) Third pereopod. (E) Uropod.
FIG. 4 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 4. Eugerda latipes (Hansen, 1916). (A) Dorsal view. (B) First pereopod. (C) Uropod. (D) Antennula. (E) Eugerda svavarssoni n. sp. Dorsal view of holotype female, length 2.2 mm. (F) Antennula and peduncle of antenna.
FIG. 13 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 13. Antennula of species of the diOEerent genera of the subfamily Leutzinae. (A) Regabellator profugus. (B) Nannoniscus muscarius. (C) Rapaniscus dewdeneyi. (D) Nannoniscoide s angulatus. (E) Hebefustis vafer. (Sources various.)
FIG. 9. Leutziniscus jebamoni n. gen. n in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 9. Leutziniscus jebamoni n. gen. n. sp. Holotype female, length 5.8 mm. (A) Dorsal view. (B, C) First pereopod. (D, E) Second pereopod. (F) Antennula. (G) Operculum. (H) Uropod.
Evolution and phylogeny of the deep-sea isopod families Desmosomatidae Sars, 1897 and Nannoniscidae Hansen, 1916 (Isopoda: Asellota)
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Figure 18 in A new genus and new species of Desmosomatidae (Crustacea: Isopoda: Asellota) from the deep sea of south-eastern Australia
Figure 18. Echinopleura cephalomagna sp. nov. Paratype female. NMV J18601. Posterior pereopods, pleopods (Op, Plp 3, Plp 4, Plp 5, Urp).
Figure 4 in A new genus and new species of Desmosomatidae (Crustacea: Isopoda: Asellota) from the deep sea of south-eastern Australia
Figure 4. Paradesmosoma australis sp. nov. Holotype female. NMV J18608. (A) Lateral and (B) dorsal views.
Figure 5 in A new genus and new species of Desmosomatidae (Crustacea: Isopoda: Asellota) from the deep sea of south-eastern Australia
Figure 5. Paradesmosoma australis sp. nov. Holotype female. NMV J18608. Antennae, mouthparts and pereopod I.
FIG. 8 in Desmosomatidae and Nannoniscidae (Crustacea, Isopoda, Asellota) from bathyal and abyssal depths oOE North Carolina and their evolution
FIG. 8. Genus Nannonisconus± male, N. latipleonus Schultz 1966 of the subfamily Conusinae.
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