Diopatra undetermined
Creators: name: Bharathidasan, Veeraiyan
name: Borisanova, Anastasia O.
name: Sarathy, Palanivel Partha
name: Murugesan, Perumal
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Eunicida
Onuphidae
Diopatra
Diopatra undetermined

description: Species: Diopatra sp.
Description: Diopatra sp. specimen is incomplete and has only 75 segments, body length 2.25 cm, body width 0.3 cm. Prostomium pointed with two subulate frontal lips. Prostomial appendages are presented by 3 antennae, and 2 palps (Fig. 2A). Palps reach chaetigers 1-3, antennae reach chaetigers 4-9. Ceratophores of palps and antennae with 7-16 ceratophoral rings (Fig. 2A). The posterior end is naturally wounded and regenerated (Fig. 2B). The parapodia of first four chaetigers are modified. Modified parapodia with rounded presetal and subulate postsetal lobes (Fig. 2D). Dorsal cirri are subulate, becoming very slender posteriorly, ventral cirri are subulate (Fig. 2C & D). The gills are developed in parapodia starting from the 5 th segment (Fig. 2A). Postsetal lobes of parapodia become gradually smaller from the anterior parapodium 5 th to 15 th chaetigers, but remain as small lobes into posterior region (Fig. 2E). The dorsal cirri penetrating with 5-6 fine chaetae (Fig. 2F).
Limbate chaetae: The limbate chaetae of the anterior parapodia are fine serrated. The first parapodium has single limbate chaetae (Fig. 2G), and second parapodium has two limbate chaetae (Fig. 2K) (one long and one small limbate chaetae). The median chaetigers with 4-5 strongly serrated upper limbate chaetae (Fig. 3A) and 8-10 fine serrated lower limbate chaetae (Fig. 3B).
Aciculae: Anterior parapodia (from first to four chaetiger) with three aciculae. One aciculae is long and two aciculae are of median size (Fig. 2H. The parapodia of the chaetigers from the middle part of the body with three unmodified upper aciculae (Fig. 3C), and the median aciculae with strongly bended distal end (Fig. 3D).
Pseudocompound hooks: Parapodia 1-2 with 4 slender pseudocompound hooks (Fig. 2C & D); The first parapodia with 1 upper hook, 2 median pseudocompound hooks thicker and long hoods (Fig. 2I & J), and the small and weak ventral pseudocompound hook. The second parapodia with 1 thick upper and 1 thick median pseudocompound hooks (Fig. 2L & M), and 1 medium-sized median pseudocompound hook (Fig. 2N), and smooth, incomplete ventral pseudocompound hook (Fig. 2O). The hoods of all the hooks are long.
Pectinate chaetae: Pectinate chaetae with 10 teeth in slightly oblique combs (Fig. 2P). First five parapodia with four pectinate chaetae per parapodium. Parapodia of median chaetigers with 8-10 pectinate chaetae per parapodium. Each pectinate chaeta with 12-16 teeth in slightly oblique comb (Fig. 3 F-H). Chaetae of parapodia from the middle part of the body with two bidentate subacicular hooks, with strong hoods (Fig. 3E).
description: Published as part of Bharathidasan, Veeraiyan, Borisanova, Anastasia O., Sarathy, Palanivel Partha & Murugesan, Perumal, 2022, New entoproct-polychaete association recorded in the Bay of Bengal, southeastern coast of India, pp. 482-500 in Zootaxa 5100 (4) on page 484, DOI: 10.11646/zootaxa.5100.4.2, http://zenodo.org/record/6224790