Eisothistos Haswell 1884

• Main Authors: Knight-Jones, E. W., Knight-Jones, Phyllis
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Expanathuridae; Eisothistos; Walker Bay
• Online Access: https://doi.org/10.5281/zenodo.5305539; http://treatment.plazi.org/id/0382E178FFD7FF97599886B0B04EBBB5

Eisothistos bi dus sp. nov. (gure 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, ve ocelli per eye (gure 8A), each antennule basal article with anterior projection, antepenultimate and penultimate articles each with an aesthetasc (gure 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. gure 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 (gure 8G) like gure 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 (gure 9A). Male characters are (1) absence of leaf-like forward extensions from antennule 1 basal articles (also absent in gure 7A and in male Eisothistos teri ) and (2) pleonites 1–3 each as long as pereonite 7 (gure 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 gure 9A), (4) ca seven ischial studs on each pereopods 2 and 3, arranged as in gure 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 (gure 8J). Other material . Manca from Miller’s Point, 1.8 mm long (gure 8C), telson with three small keel spines, hind margin ...