Paraprocerastea

Nygren, Arne, 2004, Revision of Autolytinae (Syllidae: Polychaeta)., Zootaxa 680, pp. 1-314: 98-100

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-CC16-4E43-FEE8-7B978AB9830D

treatment provided by

Plazi

scientific name

Paraprocerastea
status

 

Paraprocerastea  San Martín & Alós, 1989

Paraprocerastea  San Martín & Alós, 1989: 872 –877, fig. 1 A –L.

Linnean name definition. Type species Paraprocerastea crocantinae  San Martín & Alós, 1989 by original designation.

PhyloCode definition. No name definition provided.

Apomorphies. Clade supported by four morphological apomorphies ( Fig. 4View FIGURE 4): 1) cirrostyles egg shaped (character 15), other most parsimonious reconstructions (MPRs) possible, character state change is a parallelism; 2) simple dorsal chaetae of medium thickness (character 36); 3) simple dorsal chaetae even (character 37), character state change is a reversal; 4) pharynx sinuation minute (character 39), character state change is a parallelism.

Paraprocerastea crocantinae  San Martín & Alós, 1989 (Fig. 44 A –D)

Paraprocerastea crocantinae  San Martín & Alós, 1989: 872 –877, fig. 1 A –L. San Martín 2003: 458 –460, fig. 250 A –L.

Material examined. Spain: holotype MNCNAbout MNCN 16.01 / 620, Cabo de Creus, cala Taballera, Gerona, calcareous concretions of Mesophyllym lichenoides and Lithophyllum expansum  , 12 m; 1 paratype on slide MNCNAbout MNCN 16.01 / 622, off Los Genoveses inlet, Alméria, rhizomes of Posidonia oceanica  , 3 m, June 1986.

Diagnosis. Procerini  with only simple chaetae, and with dorsal cirri on all segments.

Description. Holotype complete, length 2.5 mm for 18 chaetigers (Fig. 44 A) (length in paratype 3.4 mm for 33 chaetigers), width excluding parapodial lobes 0.3 mm at level of proventricle. Preserved material brownish, no colour markings. Ciliation not assessed. Body shape, excluding parapodial lobes, cylindrical in transection, venter flattened. Body width fairly constant with tapering end (Fig. 44 A).

Prostomium rounded rectangular, wider than long. Four eyes, with lenses, in trapezoid arrangement. Eyes separated; eye spots present. Palps do not project in front of prostomium. Palps fused. Nuchal epaulettes not possible to assess, occipital flap not observed.

Median antenna reaching chaetiger 3–4. Lateral antennae 2 / 3 in length of median antenna. Dorsal tentacular cirri and first dorsal cirri, length 1 / 2 of lateral antennae. Ventral tentacular cirri 1 / 2 as long as dorsal pair. Alternation in direction of cirri not assessed. Cirri from chaetiger 2, of equal length, c. 1 / 8 of body width excluding parapodial lobes. Small cirrophores present on tentacular cirri, and first dorsal cirri; cirrophores otherwise absent. Lateral antennae, tentacular cirri and first dorsal cirri club shaped, median antenna cylindrical, dorsal cirri from chaetiger 2, ovoid to egg shaped.

Parapodial lobes rounded, small. All chaetigers with 1–2 aciculae. Chaetigers 1–4 with 4 simple chaetae, following chaetigers with 3 simple chaetae (Fig. 44 B). Denticulation present along "fusion line" (Fig. 44 B). Simple chaetae with small distal tooth; serration absent. Single medium­thick bayonet chaetae (Fig. 44 B), distally denticulated, beginning at chaetiger 1.

Pharynx with minute sinuation anterior to proventricle. Trepan in tentacular segment, with 19–20 equal teeth (23 in paratype) (Fig. 44 C, D). Basal ring absent; infradental spines absent. Proventricle equal in length to 1.5 segments in chaetiger 3–4 (4–5 in paratype) with 19–22 rows of square shaped muscle cells. Two anal cirri (Fig. 44 A), as long as 1 / 3 of body width at level of proventricle.

Reproduction. Unknown.

Habitat. Calcareous concretions of Mesophyllym lichenoides and Lithophyllum expansum  , 12 m.

Distribution. Mediterranean coast of Spain.

Remarks. Paraprocerastea crocantinae  is most similar to taxa in Procerastea  , in both general body outline and in the shape of the simple chaetae. Dorsal cirri is, however, absent in atokes of Procerastea  from chaetiger 2, while present on all chaetigers in P. c ro ­ cantinae. The bayonet chaetae in Procerastea  is of the thick, distally dilated, type, while a thinner, and even bayonet chaetae is present in P. crocantinae  . The bayonet chaetae is, however, not as thin as in e.g. Autolytus  , and is therefore called medium­thick. Paraprocerastea crocantinae  was described as having an occipital flap covering most of prostomium; this could not be confirmed.

MNCN

Museo Nacional de Ciencias Naturales

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Loc

Paraprocerastea

Nygren, Arne 2004

2004
Loc

Paraprocerastea

San 1989: 872

1989
Loc

Paraprocerastea crocantinae

San 2003: 458
San 1989: 872

1989