Paraproceraea , Nygren, Arne, 2004

Nygren, Arne, 2004, Revision of Autolytinae (Syllidae: Polychaeta)., Zootaxa 680, pp. 1-314: 104-105

publication ID

10.5281/zenodo.157809

publication LSID

lsid:zoobank.org:pub:471A4E52-4C92-44F8-AB38-CD03071C0067

persistent identifier

http://treatment.plazi.org/id/03CDB626-CC10-4E48-FEE8-7C2D8B7A83E5

treatment provided by

Plazi

scientific name

Paraproceraea
status

gen. n.

Paraproceraea  gen. n.

Linnean name definition. Type species Autolytus(Autolytus) tamanus Imajima, 1966  .

PhyloCode definition. No name definition provided.

Apomorphies. Supported by 2 morphological characters ( Fig. 4View FIGURE 4): 1) nuchal epaulettes extend to chaetiger 3 (character 8), character state change is a reversal, and a parallelism; 2) number of teeth> 65 (character 40), character state change is a parallelism.

Etymology. Para is greek and means close to. Named for its similarity to Proceraea  .

Paraproceraea tamana ( Imajima, 1966)  comb. n. (Fig. 47 A –F) Autolytus (Autolytus) tamanus Imajima, 1966: 46  –47, fig. 11 E –K. NOT Autolytus tamanus  San Martín 1994 272–273, fig. 2 A –D.

Material examined. Japan: holotype NSMT­Pol H­ 1, Tamano, Torishima, 1964, 2 m.

Diagnosis. Procerini  with nuchal epaulettes reaching middle of chaetiger 3, a thick type of bayonet chaetae, distally denticulated, and 90 small subequal teeth in trepan.

Description. Length 7.5 mm for 42 chaetigers, incomplete, width excluding parapodial lobes 0.5 mm at level of proventricle. Preserved material yellowish without colour markings, eyes brownish red. Live specimen orange with brown spot at the base of each dorsal cirri ( Imajima 1966).

Body, excluding parapodial lobes, cylindrical, venter flattened; body width fairly constant. Ciliation not possible to assess, anterior segments appear tri­annulated (Fig. 47 A).

Prostomium rounded rectangular, wider than long. Four eyes, with lenses, in trapezoid arrangement, anterior pair larger. Eyes large, in dorsal view almost confluent (Fig. 47 A); eye spots absent. Palps in dorsal view projecting 1 / 4 of prostomial length (Fig. 47 A), fused. Extension of nuchal epaulettes to half of chaetiger 3 (Fig. 47 A).

Antennae and first dorsal cirri lost. Dorsal tentacular cirri reaching chaetiger 7. Ventral tentacular cirri 1 / 3 as long as dorsal pair, second dorsal cirri as long as ventral tentacular cirri. From chaetiger 1–27 cirri with usual alternation in direction, followed by 3 DDUUgroups. Dorsal cirri from chaetiger 3 of equal length (Fig. 47 B), 1 / 3 of body width excluding parapodial lobes. Cirrophores on tentacular segment and first dorsal cirri present; cirrophores otherwise absent (Fig. 47 B). All appendages cylindrical, including lost anterior appendages ( Imajima 1966).

Parapodial lobes rounded, small (Fig. 47 B). Aciculae numbering 2–3 in all present chaetigers. Chaetal fascicle with 10–15 compounds. Compound chaetae with small distal tooth in anterior 5–10 chaetigers (Fig. 47 C), more posterior with larger distal tooth, still smaller than subdistal tooth (Fig. 47 D); serration present. Single thick bayonet chaetae, distally denticulated (Fig. 47 E), beginning from chaetiger 20.

Pharynx with sinuation anterior and lateral to anterior half of proventricle (Fig. 47 F).

Trepan dissected, lost. Proventricle equal in length to 2 segments in chaetiger 5–6 with c. 25 rows of square shaped muscle cells. Posterior part lost.

Reproduction. Unknown.

Additional information. Imajima (1966) describes the trepan as having 90 subequal teeth arranged in one ring.

Habitat. Intertidal.

Distribution. North West Pacific. Southern Japan. Only known from type locality.

Remarks. Paraproceraea tamana  is only known from one anterior end. The record of P. tamana  from Cuba is not considered reliable, since the specimen has a thin bayonet chaetae, subdistally denticulated while the bayonet chaetae of P. tamana  is thick, distally denticulated. The details of compound chaetae and proventricle do not match either. P. tamana  is unique in having a combination of thick bayonet chaetae with 90 small subequal teeth. Unfortunately the trepan has been lost, and it is not possible to confirm Imajima's observations. Other Procerini  with many teeth (> 40) in their trepan includes Imajimaea zonata  , I. japonensis  ( Imajima & Hartman, 1964), and I. tsugara ( Imajima, 1966)  ; all these taxa have thin bayonet chaetae, subdistally denticulated.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Loc

Paraproceraea

Nygren, Arne 2004

2004
Loc

Paraproceraea tamana (

Imajima 1966

1966
Loc

Autolytus (Autolytus) tamanus

Imajima 1966: 46

1966