Coricuma Watling & Breedy, 1988
|
publication ID |
https://doi.org/ 10.11646/zootaxa.5061.2.13 |
|
publication LSID |
lsid:zoobank.org:pub:D7488F85-97B1-42B9-9619-93219D16F5A9 |
|
DOI |
https://doi.org/10.5281/zenodo.5699743 |
|
persistent identifier |
https://treatment.plazi.org/id/03FB87EA-787C-116B-599E-F92FB7B9FCF6 |
|
treatment provided by |
Plazi |
|
scientific name |
Coricuma Watling & Breedy, 1988 |
| status |
|
Genus Coricuma Watling & Breedy, 1988 View in CoL
Type species: Coricuma nicoyensis Watling & Breedy, 1988 View in CoL
Diagnosis. “Body long and slender, pointed anteriorly; pseudorostrum moderately developed, efferent orifice anterior; eyelobe linguiform, pigmented; male and female with serrations on carapace dorsal crest; exopod only on pereiopod 1 in both sexes; pereiopod 2–5 6-articulate; male with 2 pairs of pleopods; male antenna 2 short, clasping” ( Watling & Breedy, 1988).
Species: Coricuma nicoyensis Watling & Breedy, 1988 , C. insolita n. comb. ( Petrescu, 1992).
Coricuma insolita n. comb. ( Petrescu, 1992).
Syn. Iphinoe insolita Petrescu, 1992: 4–30 , figs; 1995: 28–33, figs 2–5;— Haye, 2007: 21.
Material : 56 ovigerous ♀, 338 non-ovigerous ♀♀, 240 ♂♂, 128 mancae, 7 damaged; eastern Lembeh Island, Indonesia, 1m depth during low tide, sandy bottom with sea grass patches; ZMH K 60864 View Materials .
11 non-ovigerous ♀♀, 4 adult ♂♂, 10 mancae; Raja Ampat , Indonesia 0.3 to 0.6 m depth during low tide, sandy bottom; ZMH K 60865 View Materials .
Remarks. Both species, Coricuma nicoyensis and Iphinoe insolita identified from the material show very similar genus-level characters, i.e., a relatively short antenna 2, the presence of 2 pairs of pleopods in adult males and the presence of the exopod only on pereiopod 1. Consequently they are considered congeneric, with Coricuma insolita n. comb. representing the second species of the genus. Transferring I. insolita to the genus Coricuma clears up the diagnosis for the genus Iphinoe as in all the remaining species, wherever the males are known, adult males do have 5 pleopods in males.
The main differences between the species C. nicoyensis and C. insolita ( Table 1 View TABLE 1 ) are in the number of dorsal teeth on the carapace, the length proportion of the cephalothorax to the abdomen, the number of larger articles in the main flagellum of the first antenna, the armature and length proportion of the uropod endopod basal and distal articles, and the shape of the pleopods in males.
The intraspecific differences between the specimens from Bunaken, reported by Petrescu (1995), Lembeh Island and Raja Ampat (this study) are quite subtle ( Table 2 View TABLE 2 ):
The length proportions of the cephalothorax and abdomen: In ♂♂ from Bunaken the abdomen is clearly longer than the cephalothorax, in the ♂♂ from Lembeh Island ( Fig. 1a View FIGURE 1 ) and in those from Raja Ampat ( Fig. 3a View FIGURE 3 ) it is almost equal in length.
A1: The first antenna has a remarkable structure, as the main flagellum of the first antenna has two larger basal articles followed by a long structure which resembles a very big (almost as wide as the second article of the main flagellum) aesthetasc or, according to Petrescu (1995), a number of quite small articles ( Figs 2d View FIGURE 2 , 3d View FIGURE 3 , 4d View FIGURE 4 ) in varying numbers within the specimens. Petrescu (1995) reported “2 basal well developed articles and few more distal ones (9 in holotype)” for the male, for the female he figured 2 larger basal articles in the main flagellum followed by 5 short articles. The number of the “short articles of the main flagellum” in ♂♂ is larger in the specimens from Lembeh Island ( Table 2 View TABLE 2 ) and Raja Ampat ( Fig. 3d View FIGURE 3 ) compared to those from Bunaken. Also for the female Petrescu (1995) figured the accessory flagellum more than half as long as the basal article of the main flagellum.
The number of dorsomedian teeth on the ♂♂ carapace is 4–5 in the specimens from Bunaken, 3 in the Lembeh Island ♂♂ ( Fig. 1b View FIGURE 1 ) and 2 in the Raja Ampat ♂♂ ( Fig. 3b View FIGURE 3 ); for the ♀ Petrescu (1995) reported 5 teeth, however, there are 6–8 in the Lembeh Island ♀♀ ( Table 2 View TABLE 2 , Fig. 2b View FIGURE 2 ) and 5 in the Raja Ampat ♀♀ ( Table 2 View TABLE 2 , Fig. 4b View FIGURE 4 ).
Also the setation of the uropod endopod basal article differs: in ♂♂ from Bunaken there are 1 cuspidate + 5 microserrate reported, from Lembeh Island and Raja Ampat ♂♂ there are 6 microserrate ( Figs 1c View FIGURE 1 , 3c View FIGURE 3 ); in ♀♀ from Bunaken are 3 cuspidate + 2 microserrate reported, in the Lembeh Island ♀♀ we see 3 cuspidate + 3 microserrate setae+ serrated margin ( Fig. 2 c View FIGURE 2 ), in the Raja Ampat ♀♀ there are 4 cuspidate setae + serrated margin ( Fig. 4c View FIGURE 4 ).
The setation of the uropod endopod distal article is quite similar in the specimens of all regions sampled; however, the females from the Lembeh Island as well as from Raja Ampat do have, besides setations, also a serrated inner margin ( Figs 2c View FIGURE 2 , 3c View FIGURE 3 , 4c View FIGURE 4 ) and those from Bunaken have not.
On the flagellum of antenna 2 in ♂♂ from the Lembeh Island and from Raja Ampat there are special clasping mechanisms with a verrucous basis ( Figs 1d View FIGURE 1 , 3f, 3g View FIGURE 3 ), only visible in higher magnification.
The specimens from Lembeh Island and Raja Ampat are obviously ( Table 2 View TABLE 2 ) conspecific. The differences between the specimens from this study and those described by Petrescu (1995) seem to be too weak to justify the designation of a new species for specimens obtained not too far away from the type locality of C. insolita n. comb.
TABLE 2. The intraspecific variability in Coricuma insolita n. comb. from different Indonesian regions (n.d. means: no
| region | Bunaken | Lembeh Island | Raja Ampat |
|---|---|---|---|
| author | Petrescu 1995 | this study | this study |
| depth (m) | 1–5 | 1 | 0.3–0.6 |
| Characters: | |||
| ♂ body length (mm) | 3.5 | 3.2 | 3.37 |
| ♀ body length (mm) | 3.7 | 5.2 | 3.45 |
| ♂ length proportion cephalothorax: abdomen | 0.8 | 0.95 | 0,97 |
| ♀ length proportion cephalothorax: abdomen | n.d. | 1.0 | 0,93 |
| A1, article 3 | longest | longest | longest |
| ♂ A1, accessory flagellum | minute | minute | minute |
| ♀ A1, accessory flagellum | > half basal article main flagellum | minute | minute |
| ♂ A1, main flagellum no. articles | 2 bigger basal + 9 small | 2 bigger + 22 small | 2 bigger + 20 small |
| ♀ A1, main flagellum no. articles | 2 bigger basal + 5 small | 2 bigger + 28 small | 2 bigger + 20 small |
| ♂ A2, flagellum, no of articles | 16 | 16 | 16 |
| ♂ no. dorsomedian teeth on carapace | 4–5 | 3 | 2 |
| ♀ no. dorsomedian teeth on carapace | 5 | 6–8 | 5 |
| ♂ uropod peduncle inner margin, no. setae | 12 | 11 microserrate setae | 11 – 13 microserrate |
| ♀ uropod peduncle inner margin, no. setae | 13 | 11 cuspidate | 11 cuspidate |
| ♂ uropod endopod basal article, no. setae | 6 | 6 microserrate | 6 microserrate |
| ♀ uropod endopod basal article, no. setae | 5 | 3 cuspidate+ 3 microserrate + serrated margin | 4 + serrated margin |
| ♂ uropod endopod distal article, no. lateral setae | 4 | 4 to 6 microserrate | 4 microserrate |
| ♀ uropod endopod distal article, no. lateral setae | 4 | 5 microserrate + serrated margin | 5 microserrate + serrated margin |
| ♂ uropod endopod distal article, no. terminal setae | 3 | 3 microserrate | 3 microserrate |
| ♀ uropod endopod distal article, no. terminal setae | 3 | 1 microserrate + 2 simple | 1 microserrate + 2 simple |
| ♂ length proportion basal: distal article of endopod | 1.3 | 1.5 | 1 |
| ♀ length proportion basal: distal article of endopod | 1.2 | 1.2 | 1 |
| Pleopods | rami subequal to peduncle | rami subequal to peduncle | rami subequal to peduncle |
| ZMH |
Zoologisches Museum Hamburg |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.