Dorsocentrals see dorsocentral bristles

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dorso-humeral region (ARTHRO: Insecta) The humeri of Diptera.

dorsomedian a. [L. dorsum, back; medius, middle] Pertaining to the true middle line on the dorsum of an individual.

dorsomedian groove (ARTHRO: Crustacea) In certain Deca-poda, a longitudinal groove extending from the tip of the rostrum to the posterior carapace margin dorsomedially.

dorsomesal a. [L. dorsum, back; Gr. mesos, middle] Being at the top and along the midline.

dorsomeson n. [L. dorsum, back; Gr. mesos, middle] Where the meson meets with the dorsal surface of the body.

dorso-pleural line (ARTHRO: Insecta) The line of separation between the dorsum and the limb bases of the body, often marked by a fold or groove.

dorsopleural suture (ARTHRO: Insecta) In Diptera, a suture separating the mesonotum from the pleuron.

dorsoscutellar bristles (ARTHRO: Insecta) In Diptera, a pair of bristles on the dorsal portion of the scutellum, one on each side of the midline.

dorsotentoria n. [L. dorsum, back; tentorium, tent] (ARTHRO: Insecta) The dorsal arms of the tentorium.

dorsoventral a. [L. dorsum, back; venter, belly] In the axis or direction from the dorsal toward the ventral sufaces; bifacial; dorsiventral.

dorsoventralis posterior (ARTHRO: Crustacea) In Decapoda, a prominent muscle connecting the head apodemes with the inner surface of the carapace posterior to the cervical groove.

dorsum n. [L. dorsum, back] The back or upper surface of an organism.

dorylaner n. [Gr. dory, spear; aner, male] (ARTHRO: Insecta) A large male form of the driver and legionary ants, characterized by large, modified mandibles, long cylindrical gaster and singular genitalia.

dorylophile n. [Gr. dory, spear; philos, loving] Any obligatory guest of army ants belonging to the Dorylini.

double haploid A haploid possessing a complete genome from each of two species. see snyhaploid.

double helix Form of DNA proposed by Watson and Crick, made of two chains of nucleotides arranged spirally around each other.

double recessive A cell or organism showing the recessive phenotype.

doublure n. [F. doublure, lining] (ARTHRO) The reflected margin of a carapace, as in mantis shrimp, horseshoe crabs and trilobites.

Doyere's cone The final conical termination of a nerve fiber entering a muscle; an end plate.

drepanoid a. [Gr. drepane, sickle] Sickle-shaped; falcate; dre-paniform.

drill n. [D. drillen, to bore, drill] (MOLL: Gastropoda) A snail that preys upon other mollusks by penetrating the shell with a drilling apparatus. see radula.

dromotropic a. [Gr. dromos, race; tropein, to turn] 1. Bent in a spiral. 2. An influence affecting the conductivity of a nerve fiber.

drone n. [A.S. dran, the male bee] (ARTHRO: Insecta) A male social bee, especially a male honeybee or bumblebee.

D-shaped larval stage (MOLL) A larva in the form of a D, the back of which is the long, straight hinge; protostracum.

duct n. [L. ductare, to lead] 1. The tubular outlet of a gland for external secretion. 2. Any tube that conveys fluids or other substances.

ductule n. [L. dim. ductare, to lead] A small duct, or the beginning portion of a duct.

ductus bursae (ARTHRO: Insecta) A tube in female Lepidoptera connecting the ostium with the bursa copulatrix.

ductus ejaculatorius The median ectodermal exit tube of the male genital system.

ductus entericus (NEMATA) A duct between osmium and uvette in the demanian system.

ductus obturatus (ARTHRO: Insecta) In Siphonaptera, a primitive genital character of certain females that functions as a spermathecal duct.

ductus uterinus (NEMATA) A duct between the uterus and the demanian system.

Dufour's gland (ARTHRO: Insecta) In Hymenoptera, an abdominal gland of the sting apparatus that supposedly secrets a liquid which when applied to cell walls, forms a thin, cellophane-like, transparent, or waxy lining which may function as a chemical cue for nesting, maintaining humidity control, a defense against microbial infection and/or food source.

dulosis n. [Gr. doulosis, servitude] (ARTHRO: Insecta) Ant slavery in which a parasitic ant species raids the nests of another species to capture brood (usually pupae) to rear as enslaved nestmates.

duodecathecal a. [L. duodecim, twelve; Gr. theke, case] (ANN: Polychaeta) Pertaining to having 12 spermathecae, usually in 6 pairs.

duodenum n. [ML. duodenum, the first part of the small intestine] The anterior intestine.

dupion n. [F. doupion, double] (ARTHRO: Insecta) In Lepidoptera, a double cocoon spun by two silkworms; the silk from such cocoons.

duplaglossa n. [L. duplex, double; Gr. glossa, tongue] (ar-THRO: Insecta) A forked or divided glossa.

duplex a. [L. duplex, double] Pertaining to a polyploid having two dominant alleles for a given genetic locus (AAa); doubled.

duplicate a. [L. duplex, double] Double; twofold.

duplicato-pectinate (ARTHRO: Insecta) A bipectinate antenna with branches alternately long and short.

duplicature n. [L. duplex, double] 1. A doubling; a fold. 2. (ARTHRO: Crustacea) In Ostracoda, the calcified inner lamella of a shell that extends along the free margin of the valve and is fused to the outer lamella.

duplicature muscle fibers (BRYO) Muscle fibers that widen the anterior end of the tentacle sheath, through which the lophophore passes during protrusion and serves as fixator ligaments for protruded polypide.

duplivincular ligament (MOLL: Bivalvia) A ligament consisting of a series of bands attaching it to narrow grooves in the cardinal area of the valve.

duraphagous a. [L. durus, hard; Gr. phagein, to eat] Pertaining to animals that break shells to eat the animal inside; sclerophagus.

dyad n. [Gr. dyas, two] 1. Two chromatids that make up one chromosome in the first meiotic division. 2. A pair of cells caused by aberrant meiotic division.

Dyar's law The theory that various parts of the body increase in linear dimensions by a ratio that is constant for the species.

dynamic a. [Gr. dynamis, power] Producing motion or activity. see static.

dysodont a. [Gr. dys, bad; odos, tooth] (MOLL: Bivalvia) Having small, weak teeth close to the beak.

dysphotic a. [Gr. dys, bad; phos, light] Dim; zone between euphotic and aphotic zones in light penetration of water.

dyssaprobes [Gr. dys, bad; sappros, putrid; bios, life]

(nemata) Microbiotrophic nematodes able to invade and obtain nourishment from healthy plants.

dystrophic a. [Gr. dys, bad; trophein, to nourish] 1. Defective nourishment. 2. A lake high in undecomposed organic matter.

Dzierzon's rule (ARTHRO: Insecta) In social Hymenoptera, sex determination in which fertilized eggs become females and unfertilized eggs become males.

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How To Have A Perfect Boating Experience

How To Have A Perfect Boating Experience

Lets start by identifying what exactly certain boats are. Sometimes the terminology can get lost on beginners, so well look at some of the most common boats and what theyre called. These boats are exactly what the name implies. They are meant to be used for fishing. Most fishing boats are powered by outboard motors, and many also have a trolling motor mounted on the bow. Bass boats can be made of aluminium or fibreglass.

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