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15 results for “Tachypleus tridentatus”
Figure 7 in Population structure of Tachypleus tridentatus (Chelicerata: Merostomata) at a nursery beach in Puerto Princesa City, Palawan, Philippines
Figure 7. Number of male, female and individuals for which sex was not identified per postembryonic stage.
Figure 1 in Population structure of Tachypleus tridentatus (Chelicerata: Merostomata) at a nursery beach in Puerto Princesa City, Palawan, Philippines
Figure 1. Study area. (A) Map of the Philippines; (B) map of Puerto Bay wherein the study site is indicated (X); (C) nursery habitat of the study site.
Figure 6 in Population structure of Tachypleus tridentatus (Chelicerata: Merostomata) at a nursery beach in Puerto Princesa City, Palawan, Philippines
Figure 6. Age structure of juvenile population.
Figure 4 in Population structure of Tachypleus tridentatus (Chelicerata: Merostomata) at a nursery beach in Puerto Princesa City, Palawan, Philippines
Figure 4. Size–frequency distribution of the medium-sized individuals using a 0.1-cm interval size.
Figure 2 in Population structure of Tachypleus tridentatus (Chelicerata: Merostomata) at a nursery beach in Puerto Princesa City, Palawan, Philippines
Figure 2. Size–frequency distribution of all individuals and exuviae using a 0.2-cm interval size.
Figure 5 in Population structure of Tachypleus tridentatus (Chelicerata: Merostomata) at a nursery beach in Puerto Princesa City, Palawan, Philippines
Figure 5. Size–frequency distribution of the largest individuals using a 0.3-cm interval size.
Figure 1 in How survival and food intake of tri-spine horseshoe crabsı Tachypleus tridentatus respond to thermal variation: implications for understanding its distribution limit
Figure 1. Global distribution of T. tridentatus as reported by previous literature, and the regional changes of sea surface temperature (SST) in (a) summer and (b) winter. Note the three occurrence reports outside their geographic range: (1) a non-native population from Chubu Region, Central Japan; (2) an escape population from Okinawa Prefecture, Japan due to broken nets during transportation; (3) a sighting of single female from Jeju, South Korea, which was not associated with a known spawning or juvenile nursery habitat.
F in The morphological differentiation of two horseshoe crab species, Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura), in Hong Kong with a regional Asian comparison
F. 3. (A) Size–weight distributions of Tachypleus tridentatus males (&) and females (%) in Hong Kong. (B) Size–weight distribution of Carcinoscorpius rotundicauda males ($) and females (#) in Hong Kong.
F in The morphological differentiation of two horseshoe crab species, Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura), in Hong Kong with a regional Asian comparison
F. 2. Various body parts of the horseshoe crabs measured to the nearest millimetre. a=length of prosoma; b=length of opisthosoma; c=length of telson; d=maximum width of prosoma; e=distance between the two compound eyes; f =maximum width of opisthosoma; g=width of telson; S1–S6=length of first to sixth opisthosomal, marginal spines.
Data from: Chromosomal level reference genome of Tachypleus tridentatus provides insights into evolution and adaptation of horseshoe crabs
Horseshoe crabs including Tachypleus tridentatus are a group of marine arthropods living fossil species which have existed on the earth for 500 million years. However, the genetic mechanisms underlying their unique adaptive ability are still unclear. Here, we assembled the first chromosome-level T. tridentatus genome, and proofed that this genome is of very high quality with contig N50 1.69 Mb. By comparison with other arthropods, some gene families of T. tridentatus experienced significant expansion, whichare related to several signaling pathways, endonuclease activity, and metabolic processes. Based on the comparative analysis of genomics and 27 transcriptomes from 9 tissues, we found that the expanded Dscam genes usually locate at the key hub positions of immune network. Furthermore, the Dscam genes showed higher levels of expression in the yellow connective tissue, the birthplace of blood cells with strong differentiation capability, than the other 8 tissues. Besides, Dscam genes are positively correlated with the expression of the core immunity gene, clotting factor B, which is implicated in the coagulation cascade reaction. The effective and unusual immune ability endowed by the expansion and expression of Dscam genes in horseshoe crabs may be a factor that makes horseshoe crabs having a strong environmental adaptability with ~500 million years. The high-quality chromosome-level genome of a horseshoe crab and unique genomic features reported in this study provide important data resources for future studies on the evolutionary history of marine ecological systems.
Data from: Chromosomal level reference genome of Tachypleus tridentatus provides insights into evolution and adaptation of horseshoe crabs
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Figure 3 in Population structure of Tachypleus tridentatus (Chelicerata: Merostomata) at a nursery beach in Puerto Princesa City, Palawan, Philippines
Figure 3. Size–frequency distribution of the smaller individuals using a 0.1-cm interval size.
Figure 2 in How survival and food intake of tri-spine horseshoe crabsı Tachypleus tridentatus respond to thermal variation: implications for understanding its distribution limit
Figure 2. Effects of (a) different temperature levels for 7 days and (b) the subsequent recovery at 25°C for 3 days on the mean intake rate (%) of juvenile T. tridentatus. Values represent the mean + SD. Mann-Whitney U tests with Bonferroni correction with statistical difference between temperature levels and their recovery (p <0.05) are presented in different lowercase letters.
F in The morphological differentiation of two horseshoe crab species, Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura), in Hong Kong with a regional Asian comparison
F. 1. A map of Hong Kong showing the locations where horseshoe crabs were collected for this study.
F in The morphological differentiation of two horseshoe crab species, Tachypleus tridentatus and Carcinoscorpius rotundicauda (Xiphosura), in Hong Kong with a regional Asian comparison
F. 4. Geographic variation in maximum prosomal width of (A) Tachypleus tridentatus and (B) Carcinoscorpius rotundicauda (in part after Yamasaki et al., 1988).
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