Other formats

    Adobe Portable Document Format file (facsimile images)   TEI XML file   ePub eBook file  

Connect

    mail icontwitter iconBlogspot iconrss icon

Some New Zealand Parasitic Copepoda of the Family Anthosomidae

Description

page 9

Description

Female (figs. 25 - 36).

Overall length 9.92 mm.

Cephalothorax subrectangular, angles rounded, little longer than wide (2.67 mm × 2.52 mm), anterior three-quarters of lateral margins parallel, cephalothorax narrowing slightly posteriorly; antennae borne on anterolateral bulges of a frontal area which is one-third cephalothorax width and one-seventh cephalothorax length, marked laterally by grooves, its sublinear anterior margin forming a dip in the anterior margin of cephalothorax, remainder of anterior margin of cephalothorax an entire curve on either side of frontal region.

Second and third thoracic segments fused, as wide as long (3.20 mm × 3.35 mm), widest posteriorly, narrowing anteriorly to half this width, projections on the posterior two-fifths of the lateral margin extend over part of surface of third pereiopod, and increase this width by two-sevenths.

Fourth thoracic segment, including plate, subrectangular, angles rounded, four-fifths as wide as long (4.27 mm × 3.39 mm) narrowing to three-quarters this width posteriorly; actual segment very short.

Genital segment very small, subovate, partly hidden in ventral view by third pereiopods, which were not dissected off to reveal this segment.

Abdomen subrectangular, posterior angles rounded, width half length (0.65 mm × 0.49 mm), narrowing slightly posteriorly.

Caudal laminae, width two-fifths length (0.45 mm - 0.19 mm), widest at base, narrowing slightly distally, distal margin rounded, three smal lspines borne distally.

Egg strings 13.00 mm in length, eggs uniserial, egg strings trailing behind body.

First antenna of seven segments, basal segment half length, second and third segments subequal in length, together half basal segment length, remaining segments progressively shorter; basal segment, basal width two-thirds length, narrowing to half this width distally, with two setae on outer margin and one on inner margin; second segment as wide as long, subovate; third segment as wide at the base as second, narrowing to two-thirds this width distally, with one seta on outer margin; fourth segment subovate, four-fifths as wide as long, with one seta on outer margin; fifth segment two-thirds as wide as long, with two setae near distal margin; terminal segment, width two-thirds length, rounded distally, with five setae on inner distal region, and three small spines near outer distal region.

Second antenna of two segments, subchelate; first segment, basal width two-thirds length, narrowing to nearly half this width distally, curving slightly; second segment three-quarters length of first, basal width half length, narrowing suddenly to half this width one-third distance from base, then narrowing slowly to a sharp point distally, distal two-thirds sharply curved.

Mouth tube small (0.4 mm in length), and sharply pointed distally.

Mandibular palp biramous, rami borne on subrectangular base, outer ramus, width half length, rounded distally; inner ramus as wide as outer, two-thirds its length, both rami with one large and two small spines distally.

Maxilla of two segments, segments subequal in length, first segment subrectangular, half as wide as long; second segment basal width one-quarter length, narrowing gradually to a blunt tip, with a spine on inner margin two-sevenths distance from tip, two spines one-seventh distance from tip, and two rows each of about seven very small spines between these two and the tip.

page 10

Lernanthropus microlamini n.sp. female: fig. 25: dorsal view; fig. 26: lateral view; fig. 27: ventral view; fig. 28: spine from between first and second antennae; fig. 29: second antenna; fig. 30: mandibular palp; fig. 31: maxilla; fig. 32: tip of maxilla; fig. 33: maxilliped; fig. 34: first pereiopod; fig. 35: second pereiopod; fig. 36: caudal lamina.

page 11

Lernanthropus microlammi n.sp. female; fig. 27a: first antenna.

Maxilliped of two segments, subchelate; basal segment swollen, basal width half length, narrowing to two-thirds this width distally, outer margin strongly curved, inner margin with two small spines; second segment three-quarters length of first, basal width two-fifths length, narrowing to a point distally, sharply curved, particularly over distal half.

First pereiopod biramous, each ramus of one segment; basipod swollen, subsemicircular, half as long as wide, with a spine near base of endopod; rami subequal in length, a little shorter than basipod; exopod, width three-quarters length, rounded distally, with four blunt flattened spines on distal margin; endopod subtriangular, as wide as long, with a seta subequal in length to segment on distal apex.

Second pereiopod biramous, each ramus of one segment; basipod swollen, almost three times length of basipod of first pereiopod, similar in shape except that it swells more strongly laterally than does basipod of first pereiopod; exopod one-seventh basipod length, subsemicircular, proximal margin straight, as wide as long, with five small flattened blunt spines on distal and inner margins; endopod three-quarters length of exopod, width two-thirds length, rounded distally, with no setae.

Third pereiopod laminate, rami fused or lost, laminae a little wider than plate on fourth thoracic segment, lying transversely across body, overlapping slightly in the midline, and extending posterolaterally from the body for almost one-third their length, slightly curved, standing out at right angles from the body for a distance equal to one-fifth body length.

Fourth pereiopod biramous, rami flattened lamellae separated almost to their base, exopod, width one-quarter length, narrowing gradually to one-quarter this width distally and then rounded, extending posterolaterally beyond plate of fourth segment for more than half its length; endopod five-sevenths length of exopod, two-fifths as wide as long, inner margin sublinear, outer margin curved over distal three-fifths of its length to reduce width to one-eighth basal width, lamella then rounded distally.