Eisothistos Haswell 1884
Eisothistos biŽdus sp. nov. (Žgure 8) Material. Holotype female and senescent individual from Kalk Bay, manca from Miller’s Point, all south of Cape Town in False Bay, ca 34ss18¾S, 18ss28¾E; manca from Hermanus, in Walker Bay, ca 34ss30¾S, 19ss14¾E. All from spirorbid tubes (Paralaeospira, Pileolari...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://zenodo.org/record/5305539 https://doi.org/10.5281/zenodo.5305539 |
| Summary: | Eisothistos biŽdus sp. nov. (Žgure 8) Material. Holotype female and senescent individual from Kalk Bay, manca from Miller’s Point, all south of Cape Town in False Bay, ca 34ss18¾S, 18ss28¾E; manca from Hermanus, in Walker Bay, ca 34ss30¾S, 19ss14¾E. All from spirorbid tubes (Paralaeospira, Pileolaria or Protolaeospira) collected in shallow water, August 1971 (Knight-Jones and Knight-Jones, 1974). Description. HOLOTYPE. Mature female 2.1 mm long, ca 0.2 wide, Žve ocelli per eye (Žgure 8A), each antennule basal article with anterior projection, antepenultimate and penultimate articles each with an aesthetasc (Žgure 8D), each pereopod with subdistal wheel-joint, pereopods 2 and 3 each with two or three studs on merus and ca seven on ischium, distributed as in related species (e.g. Žgure 6F, i.e. with two ‘elbow’ studs separated by a small gap from main distal group on ischium). Telson with six long keel spines, hind telson (Žgure 8G) like Žgure 4B, C but without central seta; small dorsal seta adlateral on each side. PARATYPE. Senescent female?, body length 2.1, extended further 0.65 mm by antennules 1 and 2, which are very swollen basally (Žgure 9A). Male characters are (1) absence of leaf-like forward extensions from antennule 1 basal articles (also absent in Žgure 7A and in male Eisothistos teri) and (2) pleonites 1–3 each as long as pereonite 7 (Žgure 8J). Preponderance of female characters in paratype include (1) lack of aesthetascs and large setae from antennules 1 and 2, (2) lack of subdistal wheel-joints from pereopods, (3) lack of ‘scales’ on pereopod 1 propodus (as in Žgure 9A), (4) ca seven ischial studs on each pereopods 2 and 3, arranged as in Žgure 6F, (5) wide tail-fan (ca 0.35 mm). Telson with ca nine keel spines, hind margin as in holotype; each uropodal exopod with row of three pointed studs on dorsal side along axis of main fang (Žgure 8J). Other material. Manca from Miller’s Point, 1.8 mm long (Žgure 8C), telson with three small keel spines, hind margin (Žgure 8F) as in holotype; antennule 1 ... |
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